A time series with forecast values and error terms is presented in the following table.The mean absolute deviation (MAD) for this forecast is ___________. 
Definitions:
Major Products
The primary substances produced in the highest yield from a chemical reaction.
Major Organic Product
Refers to the primary product formed in the largest quantity during an organic chemical reaction under given conditions.
Major Organic Product
The principal compound formed in an organic reaction, often determined by factors such as stability, steric effects, and electronic configuration.
Chair Structure
A conformation of cyclohexane that resembles a chair, minimizing steric strain and maximizing stability.
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